My husband mom breed maltese for years. Most breeder prefer to have a small male and bigger female, reason being that since the mom is big can hold a lot of small puppies (small genetics coming from the dad). Small females tend to have a small litter and some super small ones are even are unable to give birth naturally. There is no problem if they are the same size or even if the male is slightly bigger. It will just mean a smaller litter of larger puppies.
make sense?
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